Abstract In this thesis, we study the effect of neutral wind and zonal electric field on the formation of occurrence of ionospheric irregularity using data from ground based GPS SCINDA , on the horizontal meridional wind model and electric field modelat Bahir Dar region in the year 2012. Irregularity strength, horizontal meridional and zonal wind magnitude and direction with magnitude of zonal electric field are computed and analyzed. It is found that zonal electric field which is greater than zero in the time between 18:00LT and 19:00LT and southward horizontal meridional wind and westward zonal wind in the time between 17:00LT and 24:00LT are good conditions for the occurrence of irregularity. The relative difference in the F region irregularity occurrence between the given five months also discussed. Keywords: Ionospheric irregularity, Scintillation index S4, electric field, neutral wind,Ap index